upgrade to .net 8

Server/Data/FlowerDatabase.cs

@@ -6,16 +6,9 @@ namespace Blahblah.FlowerStory.Server.Data;
 /// <summary>
 /// 数据库管理类
 /// </summary>
-public class FlowerDatabase : DbContext
+/// <param name="options">选项参数</param>
+public class FlowerDatabase(DbContextOptions<FlowerDatabase> options) : DbContext(options)
 {
-    /// <summary>
-    /// 构造数据库对象
-    /// </summary>
-    /// <param name="options">选项参数</param>
-    public FlowerDatabase(DbContextOptions<FlowerDatabase> options) : base(options)
-    {
-        //Database.Migrate();
-    }
 
     /// <summary>
     /// 用户集